Northern Europe consists of (in descending order of GDP) Sweden, Denmark, and Finland.

The Southern US consists of (in descending order of GDP) Texas, Florida, Georgia, North Carolina, Virginia, Tennessee, Louisiana, South Carolina, Alabama, Kentucky, Oklahoma, Arkansas, Mississippi, and West Virginia.

The Western US consists of (in descending order of GDP) California, Washington, Colorado, Arizona, Oregon, Utah, Nevada, New Mexico, Hawaii, Idaho, Alaska, Montana, and Wyoming.

The Northeastern US consists of (in descending order of GDP) New York, Pennsylvania, New Jersey, Massachusetts, Maryland, Connecticut, New Hampshire, Delaware, Maine, Rhode Island, and Vermont.

The Midwestern US consists of (in descending order of GDP) Illinois, Ohio, Michigan, Indiana, Minnesota, Wisconsin, Missouri, Iowa, Kansas, Nebraska, North Dakota, and South Dakota.

Details

It takes three US regions to catch up to the economic might of Western Europe. Western Europe has a GDP that is larger than the next two wealthiest regions combined.

According to this data, the total PPP GDP for the EU and the US is $37,686,330,000,000.